Exponential Functions and Logarithms

This video tutorial covers exponential functions, focusing on their growth and decay properties. It uses a practical example of car depreciation to illustrate how to model real-world scenarios with exponential functions. The tutorial demonstrates calculating the future value of a car and determining when its value will be half of the original purchase price, using both graphical and logarithmic methods. The lesson concludes with a summary of key points.

What is the general form of an exponential function?

• F(x) = A - B^X

• F(x) = A + B^X

• F(x) = A * B^X

• F(x) = A / B^X

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CCSS.HSF-IF.C.8B

In an exponential function, what does the base B represent when B > 1?

• Linear growth

• Constant function

• Exponential growth

• Exponential decay

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CCSS.HSF-IF.C.8B

If a car depreciates at 12% per year, what is the base B in the exponential function modeling its value?

• 0.88

• 1.12

• 1.88

• 0.12

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CCSS.HSF.LE.B.5

What is the initial value of the car in the given example?

• $36,000

• $48,000

• $24,000

• $12,000

After three years, approximately how much is the car worth?

• $11,635

• $16,355

• $13,355

• $1,635

What method is used to find when the car's value is half of its original price?

• Graphical intersection

• Numerical approximation

• Algebraic substitution

• Direct calculation

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CCSS.HSF.LE.A.4

What is the approximate time when the car's value is half of its original price?

• 6.42 years

• 4.42 years

• 3.42 years

• 5.42 years

Which mathematical tool is used to solve for the time when the car's value is half using logarithms?

• Linear equation

• Exponential function

• Quadratic equation

• Logarithmic function

What is the common log of 0.5 divided by the common log of 0.88 used for?

• Finding the initial value

• Calculating the growth rate

• Determining the time for half value

• Estimating the future value

What is the significance of the result 5.42 years in the context of the car's value?

• Time to reach the original value

• Time to reach zero value

• Time to reach half the value

• Time to double the value